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SubjectRe: [Linux v4.2] workqueue: llvmlinux: acpid: BUG: sleeping function called from invalid context at kernel/workqueue.c:2680
On Fri, 25 Sep 2015, Sedat Dilek wrote:

> >> $ egrep -nr 'save|restore|acquire|release'
> >> objdump-Dr_kernel-workqueue_o_CLANG-3-7.txt | egrep 'irq|map'
> >> 5718: 4601: R_X86_64_PC32 _raw_spin_unlock_irqrestore-0x4
> >> 5766: 4699: R_X86_64_PC32 _raw_spin_lock_irqsave-0x4
> >> 6173: 4bd9: R_X86_64_PC32 _raw_spin_lock_irqsave-0x4
> >> 6265: 4d05: R_X86_64_PC32 _raw_spin_unlock_irqrestore-0x4
> >>
> >> ...this is what I have.
> >>
> >> Does that help?
> >
> > It doesn't. I am asking for disassembly of del_timer_sync() (that's in
> > kernel/time/timer.o).
> >
>
> See attached file.

The sequence looks correct. So I don't really see what call sequence could
lead to calling flush_work() from __cancel_work_timer() with IRQs
disabled (which is what your stacktrace is suggesting).

The fact that this doesn't happen with GCC-compiled kernels is really
suspicious.

--
Jiri Kosina
SUSE Labs



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